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1 | ;; Edit Options command for Emacs. |
2 | ;; Copyright (C) 1985 Free Software Foundation, Inc. | |
3 | ||
4 | ;; This file is part of GNU Emacs. | |
5 | ||
6 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
7 | ;; it under the terms of the GNU General Public License as published by | |
8 | ;; the Free Software Foundation; either version 1, or (at your option) | |
9 | ;; any later version. | |
10 | ||
11 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
12 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ;; GNU General Public License for more details. | |
15 | ||
16 | ;; You should have received a copy of the GNU General Public License | |
17 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
18 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | ||
20 | ||
21 | (defun list-options () | |
22 | "Display a list of Emacs user options, with values and documentation." | |
23 | (interactive) | |
24 | (save-excursion | |
25 | (set-buffer (get-buffer-create "*List Options*")) | |
26 | (Edit-options-mode)) | |
27 | (with-output-to-temp-buffer "*List Options*" | |
28 | (let (vars) | |
29 | (mapatoms (function (lambda (sym) | |
30 | (if (user-variable-p sym) | |
31 | (setq vars (cons sym vars)))))) | |
32 | (setq vars (sort vars 'string-lessp)) | |
33 | (while vars | |
34 | (let ((sym (car vars))) | |
35 | (princ ";; ") | |
36 | (prin1 sym) | |
37 | (princ ":\n\t") | |
38 | (prin1 (symbol-value sym)) | |
39 | (terpri) | |
40 | (princ (substitute-command-keys | |
41 | (documentation-property sym 'variable-documentation))) | |
42 | (princ "\n;;\n")) | |
43 | (setq vars (cdr vars)))))) | |
44 | ||
45 | (defun edit-options () | |
46 | "Edit a list of Emacs user option values. | |
47 | Selects a buffer containing such a list, | |
48 | in which there are commands to set the option values. | |
49 | Type \\[describe-mode] in that buffer for a list of commands." | |
50 | (interactive) | |
51 | (list-options) | |
52 | (pop-to-buffer "*List Options*")) | |
53 | ||
54 | (defvar Edit-options-mode-map | |
55 | (let ((map (make-keymap))) | |
56 | (define-key map "s" 'Edit-options-set) | |
57 | (define-key map "x" 'Edit-options-toggle) | |
58 | (define-key map "1" 'Edit-options-t) | |
59 | (define-key map "0" 'Edit-options-nil) | |
60 | (define-key map "p" 'backward-paragraph) | |
61 | (define-key map " " 'forward-paragraph) | |
62 | (define-key map "n" 'forward-paragraph) | |
63 | map) | |
64 | "") | |
65 | ||
66 | ;; Edit Options mode is suitable only for specially formatted data. | |
67 | (put 'Edit-options-mode 'mode-class 'special) | |
68 | ||
69 | (defun Edit-options-mode () | |
70 | "Major mode for editing Emacs user option settings. | |
71 | Special commands are: | |
72 | s -- set variable point points at. New value read using minibuffer. | |
73 | x -- toggle variable, t -> nil, nil -> t. | |
74 | 1 -- set variable to t. | |
75 | 0 -- set variable to nil. | |
76 | Changed values made by these commands take effect immediately. | |
77 | ||
78 | Each variable description is a paragraph. | |
79 | For convenience, the characters p and n move back and forward by paragraphs." | |
80 | (kill-all-local-variables) | |
81 | (set-syntax-table emacs-lisp-mode-syntax-table) | |
82 | (use-local-map Edit-options-mode-map) | |
83 | (make-local-variable 'paragraph-separate) | |
84 | (setq paragraph-separate "[^\^@-\^?]") | |
85 | (make-local-variable 'paragraph-start) | |
86 | (setq paragraph-start "^\t") | |
87 | (setq truncate-lines t) | |
88 | (setq major-mode 'Edit-options-mode) | |
89 | (setq mode-name "Options") | |
90 | (run-hooks 'Edit-options-mode-hook)) | |
91 | ||
92 | (defun Edit-options-set () (interactive) | |
93 | (Edit-options-modify | |
94 | '(lambda (var) (eval-minibuffer (concat "New " (symbol-name var) ": "))))) | |
95 | ||
96 | (defun Edit-options-toggle () (interactive) | |
97 | (Edit-options-modify '(lambda (var) (not (symbol-value var))))) | |
98 | ||
99 | (defun Edit-options-t () (interactive) | |
100 | (Edit-options-modify '(lambda (var) t))) | |
101 | ||
102 | (defun Edit-options-nil () (interactive) | |
103 | (Edit-options-modify '(lambda (var) nil))) | |
104 | ||
105 | (defun Edit-options-modify (modfun) | |
106 | (save-excursion | |
107 | (let (var pos) | |
108 | (re-search-backward "^;; \\|\\`") | |
109 | (forward-char 3) | |
110 | (setq pos (point)) | |
111 | (save-restriction | |
112 | (narrow-to-region pos (progn (end-of-line) (1- (point)))) | |
113 | (goto-char pos) | |
114 | (setq var (read (current-buffer)))) | |
115 | (goto-char pos) | |
116 | (forward-line 1) | |
117 | (forward-char 1) | |
118 | (save-excursion | |
119 | (set var (funcall modfun var))) | |
120 | (kill-sexp 1) | |
121 | (prin1 (symbol-value var) (current-buffer))))) | |
122 |